THz Detection using Superconducting Tunnel Junctions with Substrate Absorber

[出版社版]We have proposed and fabricated superconducting tunnel junctions on LiNbO3 and on LiTaO3 substrates for high speed and wide energy band photon detectors working at THz-wave band. The current-voltage characteristics of these STJs were equivalent to conventional STJ, which was fabricated on sapphire substrates. Phonons that produced by irradiating 5.9keV X-ray or THz-wave in the substrates can be detected by the STJ. Comparing the experimental results for three types of STJs, phonons that produced in both LiNbO3 and LiTaO3 substrates have been detected with high absorption efficiency